Small patch for New-IsoFile

Question

I made a slight change in how New-IsoFile creates the temporary file if needed. The original used a timestamp for the filename, but I wanted to use the real GetTempFileName-call. The two changed parts are bolded below. I would appreciate any feedback!
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function New-IsoFile
  <#
   .Synopsis
    Creates a new .iso file
   .Description
    The New-IsoFile cmdlet creates a new .iso file containing content from chosen folders
   .Example
    New-IsoFile "c:\tools","c:Downloads\utils"
    Description
    This command creates a .iso file in $env:temp folder (default location) that contains c:\tools and c:\downloads\utils folders. The folders themselves are added in the root of the .iso image.
   .Example
    dir c:\WinPE | New-IsoFile -Path c:\temp\WinPE.iso -BootFile etfsboot.com -Media DVDPLUSR -Title "WinPE"
    Description
    This command creates a bootable .iso file containing the content from c:\WinPE folder, but the folder itself isn't included. Boot file etfsboot.com can be found in Windows AIK. Refer to IMAPI_MEDIA_PHYSICAL_TYPE enumeration for possible media
types:
      http://msdn.microsoft.com/en-us/library/windows/desktop/aa366217(v=vs.85).aspx
   .Notes
    NAME:  New-IsoFile
    AUTHOR: Chris Wu
    LASTEDIT: 03/06/2012 14:06:16
 #>
  Param (
    [parameter(Position=0,Mandatory=$true,ValueFromPipeline=$true)]$Source,
    [parameter(Position=1)][string]$Path,
    [string] $BootFile = $null,
    [string] $Media = "Disk",
    [string] $Title = (Get-Date).ToString("yyyyMMdd-HHmmss.ffff"),
    [switch] $Force
  )#End Param
  Begin {
    ($cp = new-object System.CodeDom.Compiler.CompilerParameters).CompilerOptions = "/unsafe"
    if (!("ISOFile" -as [type])) {
      Add-Type -CompilerParameters $cp -TypeDefinition @"
public class ISOFile
    public unsafe static void Create(string Path, object Stream, int BlockSize, int TotalBlocks)
        int bytes = 0;
        byte[] buf = new byte[BlockSize];
        System.IntPtr ptr = (System.IntPtr)(&bytes);
        System.IO.FileStream o = System.IO.File.OpenWrite(Path);
        System.Runtime.InteropServices.ComTypes.IStream i = Stream as System.Runtime.InteropServices.ComTypes.IStream;
        if (o == null) { return; }
        while (TotalBlocks-- > 0) {
            i.Read(buf, BlockSize, ptr); o.Write(buf, 0, bytes);
        o.Flush(); o.Close();
    }#End If
    if ($BootFile -and (Test-Path $BootFile)) {
      ($Stream = New-Object -ComObject ADODB.Stream).Open()
      $Stream.Type = 1  # adFileTypeBinary
      $Stream.LoadFromFile((Get-Item $BootFile).Fullname)
      ($Boot = New-Object -ComObject IMAPI2FS.BootOptions).AssignBootImage($Stream)
    }#End If
    $MediaType = @{CDR=2; CDRW=3; DVDRAM=5; DVDPLUSR=6; DVDPLUSRW=7; `
      DVDPLUSR_DUALLAYER=8; DVDDASHR=9; DVDDASHRW=10; DVDDASHR_DUALLAYER=11; `
      DISK=12; DVDPLUSRW_DUALLAYER=13; BDR=18; BDRE=19 }
    if ($MediaType[$Media] -eq $null) { write-debug "Unsupported Media Type: $Media"; write-debug ("Choose one from: " + $MediaType.Keys); break }
    ($Image = new-object -com IMAPI2FS.MsftFileSystemImage -Property @{VolumeName=$Title}).ChooseImageDefaultsForMediaType($MediaType[$Media])
    if ($Path) {
        if ((Test-Path $Path) -and (!$Force)) { "File Exists $Path"; break }
        if (!($Target = New-Item -Path $Path -ItemType File -Force)) { "Cannot create file $Path"; break }
    } else {
        if (!($Target = [IO.Path]::GetTempFileName() | Rename-Item -NewName { $_ -replace 'tmp$', 'iso' } –PassThru)) { "Cannot create ISO in %TEMP%"; break }
  Process {
    switch ($Source) {
      { $_ -is [string] } { $Image.Root.AddTree((Get-Item $_).FullName, $true); continue }
      { $_ -is [IO.FileInfo] } { $Image.Root.AddTree($_.FullName, $true); continue }
      { $_ -is [IO.DirectoryInfo] } { $Image.Root.AddTree($_.FullName, $true); continue }
    }#End switch
  }#End Process
  End {
    if ($Boot) { $Image.BootImageOptions=$Boot }
    $Result = $Image.CreateResultImage()
    [ISOFile]::Create($Target.FullName,$Result.ImageStream,$Result.BlockSize,$Result.TotalBlocks)
    $Target
  }#End End
}#End function New-IsoFile
      

Answer 1

Hi,
I recommend posting this on the QandA tab of the gallery item:
http://gallery.technet.microsoft.com/scriptcenter/New-ISOFile-function-a8deeffd/view/Discussions#content
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